The historic landmark will be lit up red, white and blue from 5pm this evening as a mark of respect for the victims of the terror attacks in Paris.

The lights on the bridge in Harlech castle will also adopt the colours of the Tricolore as a show of solidarity with France following Friday night’s events which has left at least 129 people dead,

However, castles in Beaumaris on Anglesey and Conwy will not follow suit as CADW said it is not feasibly possible to do so,

Tonight’s displays come after Welsh Government culture minister Ken Skates called on CADW, the body responsible for built heritage in Wales, to join other monuments across the world in illuminating its structures the colour of the French national flag.

Caernarfon castle lit up

A spokesman for CADW said: “The lights at Caernarfon will come on as it gets dark, they’re light sensitive and they will be on until midnight.”

In Caernarfon, a group of volunteers have been working to get the lights ready.

Volunteer Caernarfon man Wayne Owen Humphreys, one of the volunteers behind the idea, said: “I think it’s brilliant that we can light up the castle to show support to the French people and to support other countries effected with terrorists as well - and to show we will not be silenced by their actions.”

Another of the volunteers, Felinheli councillor Sian Gwenllian, said: “I was asking on Saturday what steps could be taken to show our solidarity, with the people of Caernarfon wanting to show support to the French people.

“It shows solidarity, but not just with people in Paris but with people who have been victims of terrorism all over the world.

“It’s a symbolic stand to show we will not be threatened by terrorism.

“I believe it would be a symbolic act against terrorism across the world.